Throttle-pump carburetor



an'azh ii, 193% (.1. H. Kim? 135G309 THROTTLE PUMP GARBURETOR Filed July 5, 1924 ll atentecl ll lhfild tllhlidmlhfibl It'll. KERRY, F FLINT, IVTIGHTGAN, ASSTGNQE T0 MARVEL UABQBUE'JET'JM COMPANY, 0h FLINT, Ill/TICHIGM, A lUURlElllllEtfitTTUlll till TNDTANA THRUTTlEsE-PUM'P GARTE'URETOH application filed July 5, 1924:. ilerial lde. WEl-ilfidll.

This invention relates to a pumping type high speed nozzle for carburetors wherein the sudden opening of the throttle serves to give an injection of fuel in addition to the normal supply thereof.

llt is an object of this invention to provide a throttle pump of the class described wherein the pump will respond to abnormal demands on the carburetor while being non-rew sponsive to the ordinary requirements of average operation. To accomplish this object a lost motion connection is provided whereby a predetermined movement of the throttle occurs before thepump or injector becomes operative. This movement or the throttle preterably covers the power requirements for the normal range of driving conditions for an automobile'on the level. Within this driving range an injector or pump is not ordi- .20 narily required by the average automobile engine, although of course it is within the scope of this invention to provide any degree of responsiveness of the pump to throttle movement for the special requirements of particular services.

It is another object oi this invention to combine such a throttle pump with a metering pin that normally limits the flow of fuel to the high speed nozzle of a carburetor under the normal range of operating conditions, while when the pump is brought into action the metering pin will enlarge the fuel passage to meet the abnormal requirements of the engine.

llt is also an object of this invention to provide an improved throttle pump wherein the pump is inoperative except for sudden operation of the throttle, as when quick acceleration in traffic is required.

Uther and further important objects or this invention will be apparent from the disclosures in the drawings and specification.

The invention (in a preferred form) is illustrated in the drawings and hereinafter more fully described.

()n the drawings:

Figure 1 is a vertical elevation of a carburetor with parts broken away to show the application of the device of this invention applied thereto till till) Figure 2 is a fragmentary section through the iiuel pump,

As shown on the drawings:

The carburetor chosen tor illustration comprises a float chamber 5 having an outlet 6 in as a boss 7 which will be referred to in detail later. lid-j acent the lioat chamber is the casing 8 oil the mining chamber having a flap air valve 9 arranged on a pivot 10 intersecting the axis of the chamber This valve is an cut away as at ll so as not to interfere with the high speed nozzle 12 which is fed from the outlet 6 by way of the chamber 13 and cored passage it. Also arranged in the mining chamber is a low speed venturi 15 and as needle 16 controlled nozzle 17, The usual air inlet passage 18 and choker valve 19 are shown. The end or the throttleshatt is indicated at 20. The throttle lever 21 is double ended of bell crank form, one end 22 carto rying an adjustable stop screw 23 for idling adjustment, and the other end serving as a stop defining the wide open position The pump of this invention comprises a pump casing 2% formed as part oil the can "it 'buretor body and including the chamber 13 as an enlargement of the main bore 25, which contains a piston 26 normally held up by a coil spring 27 which seats on a plug 28 between the chamber 13 and the bore 25. This no plug is provided with a restricted orifice 29 which is normally restricted by a metering pin 80 dependent "from the piston 26;. The pin 30 is tapered 0a to a small diameter for the central partot its length toenlarge the ca orifice when the piston is iorced downwardly,

The pump bore ismaintained full of fuel by the float chamber the outlet 6 or which opens into a horizontal passage 31 which in tersects the bore 25. The end at this passage to is provided with a tapered seat 32 for a ball check valve or suction valve 33, the ball being retained in lace by an inserted pin 34. Due to the horizontal arrangement of the passage the ball tends to roll away from the at valve seat 82, and a substantial pressure will be required to lift the ball valve up the in cline to its seat. The angle of this seat there fore determined the relative quicess out operation oil the pump to effect discharge llllfl necessary to acceleratethe flow of fuel for practically any degree of throttle acceleration to secure equal performance comparative with the first type of engine. In practice the required angle for a particular design of engine is easily -estahlished, it being unnecessary to vary the angleior individual motors of the'same design.

The pump piston is actuated by a plunger 35 which has a pivoted connection 36 with the arm 22 of the throttle lever as indicated at 37.. The end of the plunger is spaced from the piston when. the throttle mechanism is closed hy an amount determined by the sired range of normal op otion without pump, thus giving a lost motion connection that results reserving the pump for a normal sudden demands oi? the carburetor, such as is required in rapid acceleration The operation of this device as a pump is confined to sudden movements of the throttle mechanism which imparts suficient energy to the fuel below the piston to close the ball valve 33. On the other hand, the metering pin serves to supply more fuelto the nozzle under conditions of continued abnormal de mand such as for hill climbing where the initial pump injection is exhausted he)? the power demands drop hack to normal sting range to s service or l. gine designs,

1: am aware struction in" y promoter,

men-nee throttle and making a delayed contact With the piston to force the piston inwardly against the spring during the latter part oi the stroke of the plunger, and a spraying nozzle connected to said pump.

3. A throttle pump comprising a spring restrained piston, a plunger connected to the throttle and making a delayed contact With the piston to force the piston inwardly against the spring during the latter part 1 pump, and a metering pin attached to said piston. adapted to vary the area of said orifice.

5, In carburetor. I a f The tie, and nection with the pum l 3 permit a restri the pump and to increase the upon actuation of the pump,

- 6. a carburetor including a throttle and a Float chamber, a fuel pump operatively connected to the throttle and supplied with fuel through a passage communicating with the float chamber, and means in said comn said passage,

,. surrace upon 's movable up rvardly onto said ly be seated when the cient speed to a l xvi. 

